Do you mean Montaron?
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if so, it's not alignment dependent - Xzar will appear once you have delivered a poisoned guy to the bloke outside the Harper Hold (a random event of the 'you have been waylaid by enemies...' variety). I'd advise any alignment pary to do the quest and see what happens. It's an interesting little plot...
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Time is an illusion. Lunchtime doubly so.